To be honest, this sounds like one of those lovely mysterious Windows things that happens to everyone, particularly when the computer's been on for over 2 weeks!
Sometimes if you try doing too much at once (and that limit gets less and less the less you reboot your computer) things just stop working. To demonstrate, fill a rucksack with stones. Stand there for 30 minutes. Feel ok? Stand there for 19 days, and you will crash :tongue:
I've never had my computer on that long so I don't know if it's a bug with mIRC...I highly doubt it though as I do know people that keep mIRC running for weeks, into the months area, and they are still fine. It's just a sad fact of life that sometimes, you gotta reboot
By the way, the "fuss" is because 6.15 is a new version - it happens every time a new version comes out!